Strongly interacting Fermi systems are at the heart of many open questions in condensed matter, nuclear and high-energy physics. Ultracold atoms provide a unique opportunity to study their most interesting aspects - such as strongly correlated super fluids and collective excitations - in a tunable laboratory setting.
I will report on recent experiments that grant complete control over meso-scopic ultracold fermion systems. Using optical tweezers and novel methods for atom-resolved imaging in free space, we are able to manipulate and characterize strongly interacting systems on the single-particle level.
With these techniques, we have recently observed the "birth" of a collective mode of a few-fermion system in two-dimensional trap. This system in its ground state exhibits a shell structure of stable "magic" numbers of particles. In many-body spectroscopy, we find pairwise excitations and identify a well-deined resonance as the few-body precursor of the Higgs amplitude mode.
Our results point to a new direction for ultracold quantum gases, where few-body systems can be used to emulate atomic and nuclear physics with systematically tunable parameters.
Philipp is an experimental physicist who uses ultracold atoms to address fundamental questions in few- and many-body physics. His research interests include quantum optics, entanglement, many-body interference, and the physics optical lattices and tweezers.
Philipp received his undergraduate degree in Natural Sciences from the University of Cambridge, where he worked with Mete Atatüre on semiconductor quantum dots. His graduate work under the guidance of Markus Greiner explored bosonic few-body systems under a quantum gas microscope. Philipp received his PhD in Physics from Harvard University in 2016. Since then, he has been a postdoctoral researcher in the group of Selim Jochim at Heidelberg University, where he works on ultracold Fermi systems.